Paragraph Development：A Guide for Students of English as a Second Language a reading skills Textbooks for students of English as a second language Idioms drills for students of English as a second language A text and workbook for students of english as a second language Passive/Active Vocabulary Skills for Students of english as a Second Language A Reader for Students of English as a Second Language Science Readings for Students of English as a Second Language CONCEPTS AND COMMENTS：A Reader for Students of English as a Second Language Commercial Correspondence：for Students of English as a Second Language Reading, Thinking, Writing：A Text for Students of English as a Second Language